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Implement '%z'

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Howard Hinnant
2015-08-08 18:11:35 -04:00
parent 999dfc4b37
commit 28eadffa06
1 changed files with 61 additions and 24 deletions
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85
tz.cpp
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@@ -1637,6 +1637,66 @@ Zone::adjust_infos(const std::vector<Rule>& rules)
}
}
static
std::string
format_abbrev(std::string format, const std::string& variable, std::chrono::seconds off,
std::chrono::minutes save)
{
using namespace std::chrono;
auto k = format.find("%s");
if (k != std::string::npos)
{
format.replace(k, 2, variable);
}
else
{
k = format.find('/');
if (k != std::string::npos)
{
if (save == minutes{0})
format.erase(k);
else
format.erase(0, k+1);
}
else
{
k = format.find("%z");
if (k != std::string::npos)
{
std::string temp;
if (off < seconds{0})
{
temp = '-';
off = -off;
}
else
temp = '+';
auto h = floor<hours>(off);
off -= h;
if (h < hours{10})
temp += '0';
temp += std::to_string(h.count());
if (off > seconds{0})
{
auto m = floor<minutes>(off);
off -= m;
if (m < minutes{10})
temp += '0';
temp += std::to_string(m.count());
if (off > seconds{0})
{
if (off < seconds{10})
temp += '0';
temp += std::to_string(off.count());
}
}
format.replace(k, 2, temp);
}
}
}
return format;
}
Info
Zone::get_info(std::chrono::system_clock::time_point tp, tz timezone) const
{
@@ -1667,7 +1727,6 @@ Zone::get_info(std::chrono::system_clock::time_point tp, tz timezone) const
r.end = i->until_utc_;
r.offset = i->gmtoff_ + i->u.save_;
r.save = i->u.save_;
r.abbrev = i->format_;
}
else if (i->u.rule_.empty())
{
@@ -1677,41 +1736,19 @@ Zone::get_info(std::chrono::system_clock::time_point tp, tz timezone) const
r.begin = day_point(year::min()/boring_day);
r.end = i->until_utc_;
r.offset = i->gmtoff_;
r.abbrev = i->format_;
}
else
{
r = find_rule(i->first_rule_, i->last_rule_, y, i->gmtoff_,
MonthDayTime(tps, timezone), i->initial_save_,
i->initial_abbrev_);
auto k = i->format_.find("%s");
if (k != std::string::npos)
{
std::string abbrev = r.abbrev;
r.abbrev = i->format_;
r.abbrev.replace(k, 2, abbrev);
}
else
{
k = i->format_.find('/');
if (k != std::string::npos)
{
if (r.save == seconds{0})
r.abbrev = i->format_.substr(0, k);
else
r.abbrev = i->format_.substr(k+1);
}
else
{
r.abbrev = i->format_;
}
}
r.offset = i->gmtoff_ + r.save;
if (i != zonelets_.begin() && r.begin < i[-1].until_utc_)
r.begin = i[-1].until_utc_;
if (r.end > i->until_utc_)
r.end = i->until_utc_;
}
r.abbrev = format_abbrev(i->format_, r.abbrev, r.offset, r.save);
assert(r.begin < r.end);
}
return r;